Download Buletin Stiintific - UPB - Seria C - numar 3 - 2010

U. P. B. Sci. Bull., Series C, Vol. 72, Iss. 3, 2010
ISSN 1454-234x
Contents
AUTOMATIC CONTROL AND COMPUTERS
Ciprian Lupu, Andreea Udrea, Dumitru Popescu, Cătălin Petrescu
Numerical stability of adaptive control algorithms
3
Theodor Borangiu, Marian Croitoru
Analysis of the data transmission in the industrial automation systems
15
Vlad Tudor
Optimal loss reduction of distribution networks using a refined genetic algorithm
29
Silviu Răileanu
Production scheduling in a holonic manufacturing system using the open-control
concept
39
Radu Pietraru
Global security model
53
Bogdan Ţigănoaia, Francisc Iacob
Low distortion and robust steganography on parallel architecture CELL BE
using a shared color palette and a shared hash
63
Ioan Hălălae
Cellular automata with dynamical loop function as noise generators: statistical
aspects (1)
73
Codrin Popa
Business intelligence performance and capacity impact
83
Liliana Dobrică, Traian Ionescu, Leonard Dobrică, Sofia Elena Colesca
Spatial data acquisition, management and visualization in geographic information
systems
93
Bogdan Tudor
Zero-knowledge protocols implemented with elliptic curves
109
Dan Popescu, Dinu Pătârniche
FPGA implementation of video processing-based algorithm for object tracking
121
Marius Marcu, Dacian Tudor
High-level metrics for energy efficiency evaluation
131
Fadi Issa, Ioan Dumitrache
Hybrid geno-neuro system for optimization of control solution selection in multi
mobile robots
147
Carmen Cristiana Bucur, Traian Aurite
CAD - CAM integration optimizing data transfer between different integrated
design systems in virtual enterprise environment
Olumide Obe, Ioan Dumitrache
161
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Fuzzy control of autonomous mobile robot
173
Lucian Dragne
Geometrical representation of quantum bit operations
187
ELECTRONICS AND TELECOMMUNICATIONS
Mihaela Maliţa, Gheorghe M. Ştefan
Many-processors & Kleene’s model
199
Gheorghiţă Pescaru
Shaping security in communication infrastructures without restoring in case of
malfunction
213
Daniel Gheorghică, Victor Croitoru
Firewall policy management using secure Web system
227
ELECTRICAL ENGINEERING
Costel Păun
Aspects regarding numerical modeling of inductive heating process for low
voltage electrical cables
239
Daniela Căzănaru, Andrei Szilagyi
Evaluation of the shielding effectiveness of a multimode metallic cavity
249
Florin Ciuprina, Traian Zaharescu, Silviu Jipa, Ilona Pleşa, Petru V. Noţingher, Denis
Panaitescu
Effects of ionizing radiation on dielectric properties of LDPE-Al2O3
nanocomposites
259
Cǎtǎlina-Gabriela Popescu
Discrete resistive models for multi-rate analysis of integrated analog circuits
269
Florin Ciprian Argatu, Costin Cepişcă
Modeling dynamic high intensity discharge lamp characteristics
277
Ana-Maria Dumitrescu, Anca Stan, Dragoş Deaconu, Aurel Chirilă Valentin
Năvrăpescu, Mihaela Albu, Gianfranco Chicco
Disk-rotor servomotor fed by an AC/DC converter
285
POWER ENGINEERING
Ioniţă Dăescu, Călin Mucichescu, Basarab Guzun, Daniel Morar
Analysed transients during islanding operation of one HPP on its auxilliaries
297
Ioana Pisică
A note on rough set theory applications in power engineering
313
Răzvan Vîjeu, Victor Athanasovici
Etude experimentale de la gazeification des dechets de bois
319
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NUMERICAL STABILITY OF ADAPTIVE CONTROL
ALGORITHMS
Ciprian LUPU, Andreea UDREA, Dumitru POPESCU, Cătălin PETRESCU,
This paper analyzes the impact of modifying the control algorithm
parameters by an adaptation low on the immediate variation of the command
calculated for an adaptive control structure. A method to limit negative effect of the
large command variations due to the adaptation algorithm is proposed. The
procedure is included in a real-time control algorithm with a model reference
adaptive control mechanism designed for a class of nonlinear systems
Keywords: adaptive control, real-time, application, nonlinear
ANALYSIS OF THE DATA TRANSMISSION IN THE
INDUSTRIAL AUTOMATION SYSTEMS
Theodor BORANGIU, Marian CROITORU
In this paper is presented a communication protocol designed to the data
transfer among the automation systems which include programmable controllers. By
introducing an additional bit to identify an address or data byte, reduce the volume
of data to be processed by the MCUs slave. Decreasing the slave station
interrogation cycle period, for faster update of parameters, is realized by
minimizing the number of transmitted characters depending on the data type. To
eliminate errors due to distortions each character is sent asynchronously.
Keywords: industrial automation, data transmission, communication protocols
OPTIMAL LOSS REDUCTION OF DISTRIBUTION
NETWORKS USING A REFINED GENETIC ALGORITHM
Vlad TUDOR
The network reconfiguration in power distribution systems is realized by
changing the status of sectionalizing switches, and is usually done for loss reduction
or for load balancing in the system. An optimal loss reduction is obtained to
maintain acceptable voltage at customer loads as well as to assure sufficient
conductor and substation current capacity to handle load requirements. The
topological complexity of real distribution networks implies searching through many
U. P. B. Sci. Bull., Series C, Vol. 72, Iss. 3, 2010
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possible configurations. This combinatorial optimization problem can be resolved
using the efficient refined genetic algorithm proposed in this paper. Prim’s
algorithm is used with random costs for generating different spanning trees for
evaluation.
Keywords:
power distribution network, graph
optimization, refined genetic algorithm
theory,
loss
reduction,
PRODUCTION SCHEDULING IN A HOLONIC
MANUFACTURING SYSTEM USING THE OPEN-CONTROL
CONCEPT
Silviu RĂILEANU
Current advances in information technology and electronics allowed the
passage from the classic centralized control approach to a fully decentralized
control approach. In this context the paper proposes a new control concept in which
the commands from a superior control levels are sent as recommendations and low
level entities communicate between them in order to solve and optimize the task
given as a recommendation. After introducing the control concept, an
implementation aiming at production scheduling using a holonic approach is
illustrated. The implementation was done on a job shop type production system
containing multiple networked workstations.
Keywords: Open-control, holonic manufacturing systems, Contract Net Protocol
GLOBAL SECURITY MODEL
Radu PIETRARU
The material aims to present a security model for a particular class of
systems, systems connected to the Internet. The originality of the model is
hierarchical approach of security on three levels: level stand-alone, level local
network and level Internet; and in the selection and presentation of specific security
mechanisms used in each security level.
Keywords: security, security model, Internet security
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LOW DISTORTION AND ROBUST STEGANOGRAPHY ON
PARALLEL ARCHITECTURE CELL BE USING A SHARED
COLOR PALETTE AND A SHARED HASH
Bogdan ŢIGĂNOAIA, Francisc IACOB
This paper presents a critical steganographic analysis and a study of the Cell
BE architecture. It also describes a new high capacity and robust technique for
hiding information on color images. The image distortion after encoding the
message is low and indistinguishable to the human eye. The encoding and decoding
system uses three shared information: an image hash for protection against
steganographic attacks, a pixels palette (this is the result of applying the K-means
clustering algorithm, with some modifications) used for encoding the message and
the dimension of one piece of the image. Parallel architecture Cell BE is used for
the calculation of the hash and the pixels palette. An efficient mapping of the
application on the Cell BE architecture is proposed. New Cell BE programming
facilities such as double buffering, SIMD instructions, mailboxes, events, DMA
transfers are used.
Keywords: steganography, CELL BE, parallel architectures
CELLULAR AUTOMATA WITH DYNAMICAL LOOP
FUNCTION AS NOISE GENERATORS: STATISTICAL
ASPECTS (1)
Ioan HĂLĂLAE
The present paper is the first study of the evolution of 256 cells linear
cellular automata (CA) with global loop and dynamical modification of the rule. We
explore the random aspects in the evolution of CA.
For the definition of randomness we adjusted the one used in the algorithmic
information theory for binary strings.
We have tested 4 different operators aiming to find the best for obtaining
more randomness in the evolution of CA (more noise).
As a working tool we use experimental mathematics.
Keywords: Cellular Automata with global loop, noise generation, experimental
mathematics
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BUSINESS INTELLIGENCE PERFORMANCE AND
CAPACITY IMPACT
Codrin POPA
The actual complexity of various organizations with impact in Information
Systems reveals that the development of Business Intelligence Systems must be
integrated into the wider concept of the Systems Engineering. The whole project
should be focus in defining all the requirements and outputs and to establish the
specific pieces that compose the systems in a cycle of successive refinements. The
classical software framework must be redesign in order to enable a complex
approach where the functional and non-functional requirements are inter related.
Based on the experience achieved in several Business Intelligence implementations,
this article considers an optimal system architecture and emphasizes the proper
linkage between data model and capacity and performance of the Data Warehouse
Systems.
Keywords: Business Intelligence, Systems Engineering, Performance, Capacity,
Data Model
SPATIAL DATA ACQUISITION, MANAGEMENT AND
VISUALIZATION IN GEOGRAPHIC INFORMATION
SYSTEMS
Liliana DOBRICĂ, Traian IONESCU, Leonard DOBRICĂ, Sofia Elena
COLESCA
The paper discusses about a developer viewpoint regarding a geographic
information system (GIS) software used in geographic data acquisition,
management and visualization in a map document. GIS tools can be used effectively
to overcome problems such as time consuming, costs or human errors. The purpose
of this study is to design and implement a GIS-based application to be used in urban
management departments. Our experience contributes to the integration of spatial
data models into GIS. Also it contributes to the building of a domain knowledge
base which will be used further in the software development of applications for
urban management.
Keywords: information systems, software development, GIS, database,
georeferencing, map documents
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ZERO-KNOWLEDGE PROTOCOLS IMPLEMENTED WITH
ELLIPTIC CURVES
Bogdan TUDOR
In this paper ‘zero-knowledge’ protocols are treated in the elliptic curves
perspective. The original elementes are the optimization of the algorithms, elliptic
curves parameters and the Tate pairing calculus. The algorithms can be treated as a
framework and through the distortion maps they can be applied on every elliptic
curve pairing.
Keywords: elliptic curve, Tate pairing, zero-knowledge, distortion maps
FPGA IMPLEMENTATION OF VIDEO PROCESSING-BASED
ALGORITHM FOR OBJECT TRACKING
Dan POPESCU, Dinu PĂTÂRNICHE
In this paper we propose a chromatic-based real-time single object tracking
circuit implemented on a FPGA. For object isolation process the Mahalanobis
distance is used. The tracking process is divided in two distinct stages: color
segmentation and coordinate determination. FPGA circuit presented in this paper
can track a solid color object in a scene when it receives as input a digitized
PAL/NTSC stream. The basic blocks (Camera Interface Module, Color Space
Converter, Reference Values, Color Segmentation, Filter Bank, Blob Tracker, UART
Module, and VGA Output) where designed using VHDL as well as Verilog and
implemented on a FPGA-device in order to meet the real-time constraints.
Keywords: object tracking, color decomposition, Mahalanobis distance, FPGA
implementation, object recognition, real time image processing
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HIGH-LEVEL METRICS FOR ENERGY EFFICIENCY
EVALUATION
Marius MARCU, Dacian TUDOR
This paper tries to gather together all the aspects that are important to
implement or evaluate energy efficiency techniques in mobile computing devices.
The main goal of our work presented in this paper is to propose, implement and
validate a set of high-level metrics for energy efficiency evaluation of computing
systems or Dynamic Power Management (DPM) software frameworks. Using these
efficiency metrics we intend to evaluate and identify the hardware system and DPM
software which are the most efficient in terms of energy to run certain application.
The original aspects of the current work are the proposed evaluation framework for
energy efficiency, power consumption metrics definition and classification, new
evaluation test cases for energy efficiency and analysis of experimental results.
Keywords: power consumption, energy efficiency, high-level metrics
HYBRID GENO-NEURO SYSTEM FOR OPTIMIZATION OF
CONTROL SOLUTION SELECTION IN MULTI MOBILE
ROBOTS
Fadi ISSA, Ioan DUMITRACHE
In this paper we present a new hybrid system that combines artificial neural
networks and genetic algorithms for control solution selection in multi mobile robot
systems, since choosing a specific control solution for a robot to execute its required
task can affect the performance of other robots, thus, the performance of the robot
group as a whole. Our developed solution uses the new hybrid system in order to
search for the best control solution selection for each robot in the group, in a way
that achieves the optimum performance of the entire group.
Keywords: genetic algorithm, artificial neural networks, multi-robot groups,
performance optimization
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CAD - CAM INTEGRATION OPTIMIZING DATA TRANSFER
BETWEEN DIFFERENT INTEGRATED DESIGN SYSTEMS
IN VIRTUAL ENTERPRISE ENVIRONMENT
Carmen Cristiana BUCUR, Traian AURITE
The research results published in this paper are based on a case study for
shaft design made for machine tools using four Integrated Design Systems. At the
beginning we elaborate the SADT diagram used in CAD/CAM Industry and data
transfer. Based on these diagrams we build UML architecture. Transposing the
UML in C++ Programming language in order to improve the data transfer in a
Virtual Enterprise we obtain the agent source which can be transformed in an
import/export agent by a programmer, then the users could import the part with
historic from one IDS to another.
Keywords: data transfer, CAD/CAM, UML, ISO 10303/STEP, C++
FUZZY CONTROL OF AUTONOMOUS MOBILE ROBOT
Olumide OBE, Ioan DUMITRACHE
Seamless navigation of autonomous mobile robots in an unstructured, nonepisodic and dynamic environment is constrain by imprecision, uncertainty,
unreliability, complexity and unpredictability issues that characterize robots’
sensors and its controller. In this paper, we investigate navigation techniques for
Kephera mobile robot using fuzzy logic intelligent technique. We develop Fuzzy
logic controller (FCL) using different membership function types to navigate the
robot. We investigate the effects of membership functions types on the performance
of behaviours such as obstacle avoidance, path tracking/wall following, exploration,
and target reaching. Gaussian membership function technique is found to be most
efficient for mobile robot navigation.
Keywords: fuzzy logic, mobile robot, obstacle avoidance, sensors
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GEOMETRICAL REPRESENTATION OF QUANTUM BIT
OPERATIONS
Lucian DRAGNE
Graphical representations based on geometrical transformations are a very
expressive method of simulating the operations performed on quantum information
processing systems. Considering a single qubit system, the proofs given in this paper
justify the correspondence between a class of operations that modify the qubit state
and some geometrical transformations on the Bloch sphere.
The single qubit operations are expressed by the exponentiation of Pauli
operators, whereas the corresponding geometrical transformations are rotations on
the Bloch sphere around the coordinate axes.
Keywords: quantum computing, rotation operators, Bloch sphere
MANY-PROCESSORS & KLEENE’S MODEL
Mihaela MALIŢA, Gheorghe M. ŞTEFAN
According to [1], [2] more than one processor means multi-processors,
while many-processors refers to big-n processors. The theoretical foundation for the
two kinds of parallel machines is different and is meaningful for understanding the
evolution of computer science in the emerging parallel computing era. While a
multi-processor is a construct starting from Turing's model of computation, a manyprocessor is better explained in a different conceptual environment. We propose
Kleene's model as a theoretical framework for describing the many-processor
paradigm. In order to exemplify the many-processor approach the architecture of
the BA1024 chip, a fully programmable SoC, is presented.
Keywords: computer architecture, parallel computation, many-processor, partial
recursive functions, integral parallel architecture
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SHAPING SECURITY IN COMMUNICATION
INFRASTRUCTURES WITHOUT RESTORING IN CASE OF
MALFUNCTION
Gheorghiţă PESCARU
This paper is an attempt to analyze the likelihood of calculating an overall
security coefficient for a given communication infrastructure that can be used in
various communication services, such as e-healthcare, e-government, or other
similar services. The assumption is that providing (certain) communication services
for these types of applications is supposed to permanently allow configuration and
reconfiguration of a communication network for variable time frames. But, under
these circumstances, what can be said about the security of the resulting
infrastructures mainly if certain security parametres are paramount and required
beforehand?
Keywords: security coefficient, communication services, security parameters
FIREWALL POLICY MANAGEMENT USING SECURE WEB
SYSTEM
Daniel GHEORGHICĂ, Victor CROITORU
In recent years firewalls have seen some impressive technological advances
(e.g. stateful inspection, transparency, performance, etc.) and wide-spread
deployment. In contrast, firewall and security management technology is lacking. In
this paper we propose a secure web system for firewall policy management.
Our secure system implementation is able to manage any firewall products
that support SSH remote management. We believe that our approach is an important
step towards streamlining the process of configuring and managing firewalls,
especially in complex, multi-firewall installations.
Keywords: firewall, security, management interface, GUI, PHP, UML
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ASPECTS REGARDING NUMERICAL MODELING OF
INDUCTIVE HEATING PROCESS FOR LOW VOLTAGE
ELECTRICAL CABLES
Costel PĂUN
In this paper is presented an algorithm for numerical modeling of inductive
heating process for low voltage electrical cables.The results will be used in studies
of cables electrical isolation proprieties. It is possible to do a correlation between
thermal effect on cables isolation, produced by electrical current witch goes over
cable and lead to isolation damage.Using numerical simulation results, we can
equalise inductive heating effect witch is a test with isolation heating effect in
normal condition.The cable for study is of cylindrical section with PVC insulation
Keywords: electrical cables, induction oven,numerical simulation, PVC
insulation
EVALUATION AND DESIGN OF A SHIELDING SCREEN
Daniela CĂZĂNARU, Andrei SZILAGYI
This paper describes a work covering some aspects of the electromagnetic
compatibility (EMC) design optimization of a shield for a informatic equipment.
Based on the presented simulations, the authors stress that the shielding structure
has an own resonance frequency, the value of it is important to be known, in
conjunction with the frequency of the signals existing and propagating into the
electronic equipment shielded.
Keywords: shielding, electromagnetic compatibility (EMC), TEMPEST
EFFECTS OF IONIZING RADIATION ON THE DIELECTRIC
PROPERTIES OF LDPE-AL2O3 NANOCOMPOSITES
Florin CIUPRINA, Traian ZAHARESCU, Silviu JIPA, Ilona PLEŞA,
Petru V. NOŢINGHER, Denis PANAITESCU
The goal of this paper is to study the irradiation effects on the dielectric
behaviour of a polymer nanocomposite dielectric made of low density polyethylene
filled with nanoparticles of Al2O3. The permittivity and tan delta values were
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determined by dielectric spectroscopy over a frequency range of 1 mHz – 10 MHz
on plane samples of the tested nanodielectrics. The dependance between the filler
concentration, between 2 and 10 wt.%, and the irradiation effects on the dielectric
properties is also discussed in the paper.
Keywords: dielectric properties, ionizing radiation, nanodielectrics
DISCRETE RESISTIVE MODELS FOR MULTI-RATE
ANALYSIS OF INTEGRATED ANALOG CIRCUITS
Cǎtǎlina-Gabriela POPESCU
For the nonlinear circuits with widely-separated time scales it is used the
analysis in multi-time variables because the traditional analysis is very difficult. By
applying this approach the differential algebraic equations describing the nonlinear
analog circuits driven by multi-tone signals are transformed into multi-time partial
differential equations. In order to solve these equations, associated discrete resistive
equivalent circuits (companion models) for the dynamic circuit elements are used.
This paper propose new companion models for multi-rate analysis of integrated
analog circuits, generated by trapezoidal algorithm.
Keywords: companion models, multiple time variables, trapezoidal algorithm,
integrated circuits
MODELING DYNAMIC HIGH INTENSITY DISCHARGE
LAMP CHARACTERISTICS
Florin Ciprian ARGATU, Costin CEPIŞCĂ
This paper proposes a model curve-fitting approach for modeling HID lamps
voltage–current characteristics based on measured lamp voltage and current. The
lamp conductance is considered as a series of piecewise cubic polynomials that
describes the nonlinear voltage-current characteristic of the lamp. The proposed
model has been tested with a 70W high pressure sodium lamp. By comparing the
measured and simulated results, it shows that the proposed model can accurately
model the lamps for harmonic studies.
Keywords: model, HID lamps, cubic spline interpolation, i-v characteristic
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DISK-ROTOR SERVOMOTOR FED BY AN AC/DC
CONVERTER
Ana-Maria DUMITRESCU, Anca STAN, Dragoş DEACONU, Aurel CHIRILĂ,
Valentin NĂVRĂPESCU, Mihaela ALBU, Gianfranco CHICCO
In the paper the mathematical model of a disk-rotor servomotor is presented
along with that of a AC/DC converter. The identification method used for the
motor's electro-mechanical parameters is also presented. Finally, a comparison
between the simulated data and experimental results along with an analysis of the
converter-DRSM assembly influence over the supplying network is made.
Keywords: numerical modeling, disk-rotor DC servomotor, fully controlled
AC/DC converter
ANALYSED TRANSIENTS DURING ISLANDING
OPERATION OF ONE HPP ON ITS AUXILLIARIES
Ioniţă DAESCU, Călin MUCICHESCU, Basarab GUZUN, Daniel MORAR
The present work is aiming to study the significant dynamic behavior of one
hydro power generator HG from one hydro electric power plant HPP, together with
one electric motor ME from its internal network of auxiliaries, in the event of a
sudden load rejection that follows one normal running regime into the powerful
electric grid, to the islanding operation.
There are investigated through the Simulink program, the main transients
undergone by the assembly HG-ME. In this respect, it is focused one representative
situation in which one HPP (rated 2 x 10MW) affected by its automatic regulators is
connected – then separated from one regional part from our National Power Grid
SEN, together with one local consumer (rated 2 MW) and one electric asynchronous
motor (rated 7.5 kW), according to one typical lay-out electric diagram for the
medium hydro power plants MHPP.
Keywords: hydro power plant HPP, hydro generator HG, automatic regulators –
speed governor, voltage regulator, electric asynchronous motor ME,
electric power grid, islanding operation, Simulink , simulations
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A NOTE ON ROUGH SET THEORY APPLICATIONS IN
POWER ENGINEERING
Ioana PISICĂ
Rough Set theory, proposed by Zdzislaw Pawlak in 1982, has proved to be an
adequate technique in imperfect data analysis, which has found interesting
extensions and various applications. It can be regarded as complementary to other
theories that deal with imperfect knowledge, such as or fuzzy sets or Bayesian
inference. The paper presents some Rough Set theory applications in electrical
power engineering.
Keywords: data management, information systems, knowledge engineering,
power systems
ETUDE EXPERIMENTALE DE LA GAZEIFICATION DES
DECHETS DE BOIS
Răzvan VÎJEU, Victor ATHANASOVICI
This work is dedicated to the experimental study of wood waste gasification
using a specially designed pilot staged gasifier. The drying/pyrolysis, partial
oxidation and reduction stages are physically separated into distinct reactors.
Temperature and gas composition measurements allow the correct characterization
and attunement of process parameters for each reactor.
Ces travaux sont dédiés à l’étude expérimentale de la gazéification des
déchets de bois dans un gazogène pilote spécialement conçu ce projet. Les étages de
séchage/pyrolyse, combustion partielle et réduction sont séparées physiquement
dans des réacteurs distincts. Des mesures de température et de composition des gaz
permettent de bien déterminer et régler les paramètres de fonctionnement des
réacteurs.
Mots-clés: bois, biomasse, gazéification